WordPress at a glance
filter is not described

woocommerce_order_item_quantity filter-hook . WC 1.0

Filter order item quantity.

Usage

add_filter( 'woocommerce_order_item_quantity', 'filter_function_name_2843', 10, 3 );
function filter_function_name_2843( $quantity, $order, $item ){
	// filter...

	return $quantity;
}
$quantity(int|float)
Quantity.
$order(WC_Order)
Order data.
$item(WC_Order_Item_Product)
Order item data.

Where the hook is called

wc_reduce_stock_levels()
woocommerce_order_item_quantity
ReserveStock::reserve_stock_for_order()
woocommerce_order_item_quantity
woocommerce/includes/wc-stock-functions.php 187
$qty       = apply_filters( 'woocommerce_order_item_quantity', $item->get_quantity(), $order, $item );
woocommerce/src/Checkout/Helpers/ReserveStock.php 111
$item_quantity = apply_filters( 'woocommerce_order_item_quantity', $item->get_quantity(), $order, $item );

Where in WP core the hook is used WooCommerce

Usage not found.